On 25 September 2018, the impeller of the hydroelectric generating unit No. 4 was dismantled as part of the upgrade of TGC-1's Verkhne-Tulomskaya HPP

On 20 September 2018, Standard & Poor’s Global Ratings raised its long- and short-term issuer credit ratings on TGC-1 to “BBB-/A-3”. The outlook is stable.

On 11 September 2018, Fitch Ratings has upgraded long-term Issuer Default Ratings (IDR) of TGC-1 in foreign and national currency to “ВВB-” level, Outlook Stable, and short-term Issuer Default Ratings in foreign and national currency to “F3” level.

Apatitskaya CHPP of TGC-1 being the only heat supply source of the cities of Apatity and Kirovsk of Murmansk Oblast, switched to winter mode of operation

Grand opening of Gazprom Class took place in the State budget educational institution Gymnasium No. 426 in St. Petersburg on September 1

Power engineers repaired the superheater of the boiler unit No. 8, the drum with separational arrangements, regenerative-type air heaters and other elements of the equipment

The commission comprised of TGC-1, General Contractor Teploenergoremont LLC, and equipment producer JSC TYAZHMASH performed acceptance of the impeller for the hydroelectric generating unit No. 4 of Verkhne-Tulomskaya HPP of TGC-1 in the Czech Republic, at the plant of ČKD Blansko Holding being a subsidiary of JSC TYAZHMASH, as part of the power plant upgrade project

Power engineers of the Suna HPPs Cascade completed an overhaul of the transformer with the capacity of 31.5 MVA at Kondopozhskaya HPP

An overhaul of the hydroelectric generating unit No. 2 at Suuri Ioki HPP located on the Tulemajoki River in the Western part of Karelia was completed on 3 August 2018 as part of implementation of TGC-1's Repair and Maintenance Programme